Home / 91,089.06-135,728.04-81,151.98

Finding the Fourth Proportional to 91,089.06, 135,728.04 and 81,151.98

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Solution

The fourth proportional to 91,089.06, 135,728.04 and 81,151.98 is: 120,921.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,089.06 : 135,728.04 = 81,151.98 : x
  2. Step 2: Convert to fraction form
    91,089.06/135,728.04 = 81,151.98/x
  3. Step 3: Cross multiply
    91,089.06x = 135,728.04 × 81,151.98
  4. Step 4: Simplify right side
    91,089.06x = 11,014,599,187.52
  5. Step 5: Solve for x
    x = 11,014,599,187.52/91,089.06
  6. Step 6: Final answer
    x = 120,921.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.